package main

import (
	"fmt"
	"reflect"
)

func main() {

	//声明map的变量mapVaLiueA
	var mapVaLueA map[string]string
	fmt.Println("mapValueA:", reflect.TypeOf(mapVaLueA))
	fmt.Println(mapVaLueA == nil)
	fmt.Println("mapvalueA的长度为", len(mapVaLueA))

	//s
}
